Key ring light

[Syrus33]

Hey,

I just got a key ring light, i did a search but was unable to find anything. I was wondering if it would be possible to wire the light to turn on when the doors are open and when the headlights are turned on, im not much of an electrical expert but i know what I'm doing, most of the time anyways .

For an example, you open the door and the light turns on, then turns off when the door is closed. so then i turn on my headlights and the light will stay on with the headlights. So if anyone has any ideas???

Thanks

[OutToWinPAHC]

Just feed it off of the dome light

[Hijacker]

Hard to do that way as the dome grounds at the door switch. So tapping into it will light the keyring continuously, and since it grounds at the switch, you can't tap the ground side. A relay would work, but i dunno if he wants to wire that in. A black 5 pin relay would give him the functionality he wants though.That way he can isolate the parking light circuit from the dome light circuit, but have it all output to the same wire leading to the keyring. Cheap MS Paint diagram incoming.

[Syrus33]

thanks guys, i was thinking a relay might be what i needed but like i said I'm no expert. Cant wait for the diagram.

[Hijacker]

This one may be my worst MS Paint drawing ever. I LOVE IT.



Anyways, you'll have to completely cut the red/white line leading to the door switch and send it through the solenoid side of the relay. Then, on the naturally closed side of the relay, run a tap into the red/blue of the parking light circuit. What this will do is allow the relay to power the key ring light when you turn your parking lights on. Then, if you open up the driver's door, it will be power the relay's solenoid, switching it to the naturally open circuit. I recommend just using the door light circuit to power the NO circuit since it'll need a 12v from somewhere, and it's just easier to tap into the same wire leading to the solenoid.

Nissan 5 pin relays are black. Nissan likes to use them for naturally closed relays instead of 4 pin relays. Conversely, you can go get a bosch relay from Advance or Auto Zone as well. Those tend to not come with bases though.

This will keep the door circuit from backfeeding into the parking light circuit, and turning your parking lights on when you open the door.

[costa_rican13]

i want to get the key ring light thing!

[Syrus33]

Thanks, you guys are awsome

[krash]

Its probably easier to wire it to the drivers side footwell light. Thats where mine is wired up. Hell, even the pigtail is the same.

[Hijacker]

Not all 240s have the footwell lights. I was installing a viper alarm in a friend's car, and he didn't have any of those to work with. Had to find the R/W in the bundle heading aft under the carpet.

[Syrus33]

I have the footwell lights, i will use that as it is right there, hopefully it is not raining tomorrow.

[Syrus33]

Alright i wired it up but i think i did something wrong. The key ring works when the door is closed instead of when open. The parking lights part of it works fine.

I wired is as in hijackers awsome diagram except i used the footwell light instrad of dome cirtcuit since my dome light circuit doesnt work. Have triple checked fuses and bulb for dome light. So i cut the positive wire for the footwell light, harness end into 85 then split into 87a, other end into 86 then it continues to the light. The footwell light works like it should.

The 5 pin relay i got is from napa, gonna look at it again tomorrow morning

Thanks

[Hijacker]

Does it turn off when the door is open? Did you cut the floor lamp circuit? If you simply tap into and ground the other side of the solenoid, it will always be grounded out. But if you cut the circuit and run the relay in line, it will turn on when the doors are opened.

[Syrus33]

I cut it and ran it inline, the keyring light is off when the door is open and on when the door is closed. But the footwell light is on when the door is open and off when closed.

[Hijacker]

So to double check your pinout. 85 is your 12v signal from the R/W wire of the footwell lamp. 86 is the complete line to the footwell lamp (these two are the solenoid, so they're the pins being ran inline with the dome light/interior light circuit). 30 should be your output wire to your keyring light. 87a should be the input signal from the parking light system (R/L) an 87 should be a 12v source to be switched on when the relay is energized. I had suggested scavenging your 12v for 87 from the dome light circuit, but it might be best to just find another 12v constant and run to it. TBH, it shouldn't matter, but you can eliminate one potential issue by running a dedicated 12v to power the keyring light when the relay is energized.

[Syrus33]

Yes that is exactly what i did, ill double check it tomorrow morning to be sure. If everything looks good ill try a seperate power source, Thanks

[Razi]

I tapped into the harness for the footwell lights.


It's the 2 prong harness with Red/White, Red/Blue wires under the dashboard.

[Syrus33]

I checked the pinout on the relay, and it seems i had 87a as the 12v and 87 as the parking lights, i switch those two and now it works perfectly, thanks guys.

On a side note, what color light do you guys have in yours mine is green, just wondering

[Hijacker]

Glad to help!

WIth the way you had it set up, the circuit would be powered no matter what. Doors closed had a constant 12v going to the light, and when the door was open, it would cut the circuit to a dead circuit UNLESS the parking lights were on. Yay electricity!